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That Fatal error from the ARP helper points to a known limitation of the product that when installed as non-root, there is still a need to perform functions as root (ping, arp, etc)
This URL points to the script that should be ran to accomplish this:

If that script has been properly run, then check the /etc/fstab file for filesystem permissions.
We are seeing several cases recently where the filesystem that the ITNM files reside in have been restricted by the "nosuid" option when the filesystem was mounted. This will effectively overrule any attempt to give the necessary permissions to the ITNM files that need root permission to perform their functions.

Removal of the setting from the filesystem will resolve this issue.
Follow your operating system recommendations to set this properly and verify the problem is resolved.